2-40 HP Portable Chillers Chapter 4: Operation 29 of 70
Chapter 4: Operation 4-1 Panel Buttons, Indicator Lights, and Switches
Microprocessor Controllers
Standard chillers use a microprocessor-based PID controller. These controllers are modular,
self-contained units that can slide from their mounting housing. They are factory set and
adjusted; no field adjustment to the internal controls are necessary. Their standard operation
range is 30ºF to 65ºF (-1ºC to 18ºC). See Figure 7: Typical Portable Chiller Microprocessor
Controller.
E5CK Controller
Indicator Name Description
PV
8.8.8.8
Process Value
LED During normal operation, the top LED display on
the controller displays the actual process
temperature. It also lists parameter symbols during
setup and error messages if an error occurs.
SV
8.8.8.8
Set Value LED During normal operation, the green bottom LED
display on the controller displays the process set
point you want the chiller to maintain. It also
displays parameter and pre-set function values
during set up.
OUT1
Out 1 LED The orange OUT1 LED lights when the control
output energizes the hot-gas bypass solenoid
valve.
OUT2
Out 2 LED The orange OUT2 LED lights whenever the
process temperature is four degrees or more above
the “To Process” setpoint. The compressor then
comes on and runs until the temperature at the “To
Process” thermocouple is three degrees below the
setpoint.
MANU
MANU LED The orange MANU LED is not used and does not
light.
STOP
Stop LED The orange STOP LED is not used.
RMT
RMT LED The orange RMT LED is lit during remote
communication operation.
AT
AT LED The orange AT LED flashes during auto-tuning.